Introduce `global_changes_plugin:transform_change/3`
diff --git a/src/global_changes_httpd.erl b/src/global_changes_httpd.erl
index dc7c08a..e76b494 100644
--- a/src/global_changes_httpd.erl
+++ b/src/global_changes_httpd.erl
@@ -13,6 +13,7 @@
-module(global_changes_httpd).
-export([handle_global_changes_req/1]).
+-export([default_transform_change/2]).
-include_lib("couch/include/couch_db.hrl").
@@ -65,8 +66,11 @@
handle_global_changes_req(Req) ->
chttpd:send_method_not_allowed(Req, "GET").
+transform_change(Username, Change) ->
+ global_changes_plugin:transform_change(Username, Change,
+ fun default_transform_change/2).
-transform_change(Username, _Resp, {Props}) ->
+default_transform_change(Username, {Props}) ->
{id, Id} = lists:keyfind(id, 1, Props),
{seq, Seq} = lists:keyfind(seq, 1, Props),
Info = case binary:split(Id, <<":">>) of
@@ -100,7 +104,7 @@
{ok, Acc#acc{resp=Resp, last_data_sent_time=os:timestamp()}};
changes_callback({change, Change0}, #acc{feed="continuous"}=Acc) ->
#acc{resp=Resp, username=Username} = Acc,
- case transform_change(Username, Resp, Change0) of
+ case transform_change(Username, Change0) of
skip ->
{ok, maybe_send_heartbeat(Acc)};
Change ->
@@ -140,7 +144,7 @@
}};
changes_callback({change, Change0}, Acc) ->
#acc{resp=Resp, prepend=Prepend, username=Username} = Acc,
- case transform_change(Username, Resp, Change0) of
+ case transform_change(Username, Change0) of
skip ->
{ok, maybe_send_heartbeat(Acc)};
Change ->
diff --git a/src/global_changes_plugin.erl b/src/global_changes_plugin.erl
new file mode 100644
index 0000000..d73a541
--- /dev/null
+++ b/src/global_changes_plugin.erl
@@ -0,0 +1,40 @@
+% Licensed under the Apache License, Version 2.0 (the "License"); you may not
+% use this file except in compliance with the License. You may obtain a copy of
+% the License at
+%
+% http://www.apache.org/licenses/LICENSE-2.0
+%
+% Unless required by applicable law or agreed to in writing, software
+% distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+% WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+% License for the specific language governing permissions and limitations under
+% the License.
+
+-module(global_changes_plugin).
+
+-export([transform_change/3]).
+
+-include_lib("couch/include/couch_db.hrl").
+
+-define(SERVICE_ID, global_changes).
+
+
+%% ------------------------------------------------------------------
+%% API Function Definitions
+%% ------------------------------------------------------------------
+
+transform_change(Username, Change, Default) ->
+ maybe_handle(transform_change, [Username, Change], Default).
+
+%% ------------------------------------------------------------------
+%% Internal Function Definitions
+%% ------------------------------------------------------------------
+
+maybe_handle(Func, Args, Default) ->
+ Handle = couch_epi:get_handle(?SERVICE_ID),
+ case couch_epi:apply(Handle, ?SERVICE_ID, Func, Args, [ignore_providers]) of
+ [] ->
+ apply(Default, Args);
+ [Result] ->
+ Result
+ end.
